Demitri Constantinou is Adjunct Professor of Sport and Exercise Medicine at the University of the Witwatersrand, Johannesburg, South Africa. He has completed postgraduate studies in sport science, sports medicine and emergency medicine. He is a Fellow of the International Federation of Sports Medicine. He is founding Director of the Wits Centre for Exercise Science and Sports Medicine, which is also an accredited FIFA Medical Centre of Excellence, and FIMS Collaborating Centre of Sports Medicine.

He has served 2 terms as President of the South African Sports Medicine Association. He is past Chairman of the Therapeutic Use Exemption Commission (TUEC) and Board Member of the South African Institute for Drug Free Sport; Deputy Chair of the International Cricket Council TUE committee, and Chair of the Education Commission of the International Sports Medicine Federation (FIMS).

He has been team physician or Chief Medical Officer for South Africa in several sports competitions; including World Swimming Championships, All Africa Games, Commonwealth Games, Paralympic Games, and Olympic Games. He was Venue Medical Officer for the 2010 FIFA World Cup South Africa™.

He has written numerous peer-reviewed scientific papers, and also lay articles, book chapters and manuals